Communications: electrical – Selective – Having electron beam device
Patent
1974-06-03
1977-01-11
Wilbur, Maynard R.
Communications: electrical
Selective
Having electron beam device
175 45, 340 18NC, 340 18DC, 340 155MC, G01V 100, E21B 4702
Patent
active
040030172
ABSTRACT:
A method for determining the precise position of the drill bit, in three dimensions, in the earth during a drilling operation, with a minimum of effort and interruption to the drilling process. It provides placing a motion sensor on the drilling apparatus and a plurality of vibration sensors or geophones, positioned in a two-dimension array on the surface of the earth, above the expected position of the drill bit. To make a measurement from which can be determined the position of the bit, the drill stem is raised a selected distance and suddenly released, so that it will fall in the borehole, and the bit will strike the bottom of the hole. This impact will cause an elastic wave to be generated at the bottom of the borehole. The elastic wave will be transmitted through the earth and will be detected by the geophones. The sensor provides information from which can be determined the time when the bit strikes the bottom of the drill hole. This determines the initiation time of the elastic wave. The arrival times at the geophones of the elastic wave can be measured and the position at which the elastic wave originated can be determined. Alternative embodiments involve the use of jars in the drill string which generate secondary elastic waves. Also when the pipe is lifted and the bit is lifted off bottom, an expansion elastic wave will be initiated.
REFERENCES:
patent: 2062151 (1936-11-01), Weatherby
patent: 2898084 (1959-08-01), Eckel et al.
patent: 2933144 (1960-04-01), Scott et al.
patent: 3430193 (1969-02-01), Lindsey et al.
patent: 3817345 (1974-06-01), Bailey
patent: 3845837 (1974-11-01), McEvers, Jr. et al.
Buczinski S. C.
Senturion Sciences, Inc.
Wilbur Maynard R.
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